Here is the full list of all 37 Brawlout achievements.
The base game contains 33 achievements, and there is 1 DLC pack containing 4 achievements.
Unlock all character variants
Unlock all character colours
Win 25 Games against an AI
KO two enemies at the same time.
Unlock a character variant
Win 10 games against an AI
Complete each task in the advanced tutorial
Complete each task in the basic tutorial
Complete Easy Arcade Tower without losing a stock
Complete Hard Arcade Tower without losing a stock
Complete Medium Arcade Tower without losing a stock
Tongue Lash another Paco in the air 10 times in a row
Play 100 Couch Matches with friends
Play 15 Couch Matches with friends
Win 100 1v1 online matches
Win 200 1v1 online matches
Play 50 Couch Matches with friends
Use Chief Feathers' Firebird to collide with an opponent's Firebird
KO three enemies at the same time
Earn a KO with the final hit of Sephi'ra forward air
Link 8 Cold Shoulder trails as Olaf Tyson, without hitting the ground
Get a KO with the Drifter's Falling Slice
Earn Level 15 Mastery with 2 Brawlers
Earn Level 15 Mastery with 4 Brawlers
Earn Level 15 Mastery with 8 Brawlers
Steal an already grabbed opponent from another Paco
Play 75 Ranked Matches
Reflect the same projectile twice as the Drifter
Win an online 1v1 game with less than 10% damage taken.
Win 10 online 1v1 games with less than 10% damage taken.
Win 25 online 1v1 games with less than 10% damage taken.
Win 50 online 1v1 games with less than 10% damage taken.
Break King Apu's chain grab using a Rage Burst
Beat Mighty Paco Boss in Trials
Beat Olaf Boss in Trials
Beat Volt Boss in Trials
Complete the Trials